A Crank Is Being Turned Clockwise at 120 Rev/min

question 33

Multiple Choice

A crank is being turned clockwise at 120 rev/min. The handle is 10 cm from the axle of the crank. An observer some distance away sees the crank edge-on so he only perceives the vertical motion of the crank and not the horizontal motion. What equation describes the motion of the handle seen by the observer if at t=0 the crank is at y = 0 and moving in the negative y direction?

• A)y = (10 cm)cos((12.6 rad/s)t +3π/2)
• B)y = (10 cm)cos((12.6 rad/s + π)t)
• C)y = (10 cm)cos((12.6 rad/s)t - π/2)
• D)y = (10 cm)cos((12.6 rad/s)t)
• E)y = (10 cm)cos((12.6 rad/s)t + π/2)

---

Definitions:

Manufacturing Overhead

All indirect costs associated with the manufacturing process, including but not limited to utilities, depreciation, and salaries of supervisory staff.

Depreciation

The allocation of the cost of a tangible asset over its useful life, reflecting the loss in value over time.

Assembly Line Worker

An individual employed to work on a production line, usually performing a specific task repeatedly as part of a team.

Eraser Compound

A material used in the production of erasers, designed to remove pencil and sometimes pen marks from surfaces.